Kettle Study Notes (8) - Kettle Query Steps and Connection Steps

I. Overview　

　　Query step:
　　　　used to query the data in the data source and merge it into the main data flow.
　　Join step:
　　　　The result sets are joined by keywords. (different from the previous UNION)

Second, the query steps

　　1. Stream query

　　

　　　　Streaming query example: (note the limitation of streaming query above)

　　　　　

　　　　　　// Flow direction with i means information flow

 

　　　　　　

 　　　　　　

　　2. Database query

　　

　　Database query configuration example:

　　

　　3. web query

　　

　　　　//  Related examples, you can also see the examples in the kettle package

　　　　There should be a table input in front of the web, and the fields that store the URL and related parameters in the table